Caster



FIG. 1 is a top left perspective view of a caster showing the new design;

FIG. 2 is a top right perspective view thereof;

FIG. 3 is a bottom left perspective view thereof;

FIG. 4 is a bottom right perspective view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a right elevation view thereof;

FIG. 7 is a left elevation view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a rear elevation view thereof. 

CLAIM The ornamental design for a caster, as shown and described. 